Process of making dichlorethylene.



P. ASKENASY & M. MUGDAN.

PROCESS 0F MAKING D,IGHLORETHYLENL.V APPLIUATION` FILED 00T. 4. 1907.

924,304. k Patented June 8, 1909.

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..."'lln'llllllllll UNrrED STATES PATENT oFFIcE.

' PAUL AsxENAsY Aun MARTIN MUGDAN, or NUREMBERG, GERMANY.

, -rRooEss or MAKING DIenLoREHYLENE.

Specification of Letters Patent. Application med october 4, 1907. serial No. a95,95o.

Patented June 8, 190e.

'To all whom 'it may concern:

Be it known that we,-PAUL AsKENsY, doctor of hilosophy, chemist, a subject of the King o Prussla, German Emperor, residing at 54 Gugelstras'se, Nrnberg, Kingdom of Bavaria German Empire, and MARTIN MUGDAN, doctor f philosophy subject of the King of Prussia, German Emperor, residing at 54 Gugelstrasse, Nrnberg, 1

Kingdom of Bavaria, German Empire, have jointly invented'new and useful Improvements in Processes of Manufacturing Di' chlorinated Ethylene, of which the following is a specification. Y

This invention relates to the process of manufacturing dichlorinated ethylene from symmetrical itetrachlorinated ethene by means of metals. One \has already proposed to treat halogen derivatives ofhydrocarbons for manufacturing unsaturated comounds by means of zinc 1n presence of alcool or diluted acids. The use of alcohol is however expensive and requires also a separation of the alcohol from the productI of the reaction, which operation causes also losses of the product. The use of diluted acids causes the substitution of halogen by hydro en and losses of zinc, which is dissolved wit development of hydrogen.

We have now found that dichlorinated .ethylene'may be prepared easily with a nearly quantitative output by treating'sym-- metrlcal tetrachlorinated ethene with metals insoluble in water, but capable of developing hydrogen with hydrochloric acid, and Water, Without addition of alcohol or acids. `The metals suitable for our process are for in-` stance-iron, zinc, aluminium or alloys ofthe said metals. V

Inusing aluminium or finely divided zinc (for instance zinc dust). the process may be carried by moderately heatin the materials whereby a high evolution of eat ensues, so that further external heating is not required.

' The developed heat is sufficient for` evaporating the formed dichlorinate'd ethylene. In using compact zinc (granulated zinc, zinc scraps) or zinc alloys or iron a heating ina reflex condenser or a heating in the autoclave is required.

The drawing represents a vertical section Y of one form o f an apparatus suitable for carchemist, a

150 degrees centigrade.

rying out the present process. A is a reaction vessel, providled with an a itator c. d is a fractionating tube, w ich is destined to separate the distilling tetrachlorinated ethene and dichlorinated ethylene from each other. b is a reflux cooler. e is a cock, which is closed at the beginning of the operation.

Example I: One heatsthetetrachlorinated ethene with double its volume of water in the vessel n 'to 60 degrees oentigrade in stir- ,ring a while by means of the agitator c.

One adds gradually zinc dust. One may also add gradually the tetrachlorinated ethene in an intimately agitated mixture of Water and zinc dust. The formed dichlorinated ethylene distils and is condensed in the cooler b; it flows back into the reaction vessel. From time to time the cock is opened and the dichlorinated ethylene is led into the bottle. It is freed off from little amounts of vaporizedtetrachlorinated ethene by means ofthe fractionating tube d. From the formed chlorid of zinc the zinc may be recovered by electrolysis.

Example II: Tetraohlorinated ethene is heated with the equal amount of weight of iron scraps and double the quantity of waterv 01,110 c13012 Fe cloH oHc1+ Feel..

Whatl We claim as our invention, and ldesire to secure by Letters Patent, is

vv1. The rinated et ylene Which consists in heat' symmetrical tetrachlorinated ethene Wit y Water and `metals which are insoluble in :Water at ordinary temperature but soluble in hydrochloric acid.

2. The rocess for manufacturing dichlo- -rinated ethylene which consists in heating rocess for manufacturing dichloioo I symmetrical tetrachlorineted ethene with Water and zinc and distilling off the formed Water and metals which are insoluble in dichlorinated ethylene.

Water at ordinaiy. temperature but soluble in hydfcchlcric 'ccid ccd dicciuing ce chc lfslll 5 formed dichlorinated ethylene.

3. The Erocess for manufacturing dichlo- Witnesses: rinatedet ylene which consists in heating `LUDWIG SCUNINGER,

symmetrical tetrachlorin'ated ethene with WILHELM HIRSOHKIND. 

